Rigorous peer-reviews are the basis of high-quality academic publishing. Thanks to the great efforts of our reviewers, Fractal Fract was able to maintain its standards for the high quality of its published papers. Thanks to the contribution of our reviewers, in 2021, the median time to first decision was 20 days and the median time to publication was 41 days. The editors would like to extend their gratitude and recognition to the following reviewers for their precious time and dedication, regardless of whether the papers they reviewed were finally published:
| A. Raouf Chouikha | Jose M. Rodriguez |
| Abdellatif Ben Makhlouf | Józef Banaś |
| Abdelouahab Kadem | Juan A. Vera |
| Abderrahim Wakif | Juan González-Santander |
| Abdulkafi Mohammed Saeed | Juarez Dos Santos Azevedo |
| Abdullah Kargın | Julien Alexandre Dit Sandretto |
| Abdullah M. Alsharif | Julio Daniel Rossi |
| Abousnina Rajab | Junesang Choi |
| Adam Lecko | Kai Diethelm |
| Adel Ouannas | Kalyanasundaram Madhu |
| Adeleke Timothy Ademola | Kamal Shah |
| Agnieszka Lisowska | Kavikumar Jacob |
| Agnieszka Malinowska | Kayode Mobolaji Ajayi |
| Ahmad Golbabai | Ke Xu |
| Ahmadjan Muhammadhaji | Ketson Roberto Maximiano Dos Santos |
| Ahmed I. Zayed | Khaled M. Saad |
| Ahmed Mostafa | Khaled Mehrez |
| Ahmet Akdemir | Khaled Mohamed Khedher |
| Alberto D’Onofrio | Khaled Zennir |
| Aldo Jonathan Muñoz-Vázquez | Khalida Inayat Noor |
| Aleksander Stanislavsky | Khellaf Ammar |
| Aleksandra Tutueva | Khristo N. Boyadzhiev |
| Alessio Fiscella | Kolade Owolabi |
| Alexander Gutfraind | Konstantin Alexandrovich Rybakov |
| Alexander Iomin | Konstantinos A. Lazopoulos |
| Alexander Nepomnyashchy | Krystian Jobczyk |
| Alexandra M. Galhano | Krzysztof Gdawiec |
| Alexey L. Lukashov | Kyriakos Dimitrios Kantarakias |
| Alfonsas Vainoras | Lanre Akinyemi |
| Alfonso Infante | Laura Pezza |
| Ali Mahmoodirad | Le Dinh Long |
| Ali N. A. Koam | Leila Marek-Crnjac |
| Alina-Daniela Vîlcu | Lev Kazakovtsev |
| Alireza Moradikazerouni | Lewa Alzaleq |
| Allal Guessab | Ling Yan Hung |
| Amar Debbouche | Liping Chen |
| Anatoly A. Alikhanov | Liudmila Gorelova |
| Anbalagan Pratap | Liviu Iulian Palade |
| Andrea Burlon | Lorentz Jäntschi |
| Andrea Moiola | Lorenzo Zino |
| Andrei Pogrebkov | Lovyagin Yurii |
| Andrés Aragoneses | Luca Gemignani |
| Andrew Schumann | Luis Manuel Sánchez Ruiz |
| Andrey Bogatyrev | Luiz Roberto Evangelista |
| Andrey Cherstvy | Lukasz Janowski |
| Andrey V. Andreev | M. Almeshaal |
| Andrzej Pacana | M. Eshaghi Gordji |
| Angelica Malaspina | M. Ijaz Khan |
| Anna Borucka | Maan A. Rasheed |
| Anna Lai | Magagula Vusi Mpendulo |
| Anna Napoli | Magda Rebelo |
| Anton Kasprzhitskii | Mahdi Rezapour |
| Anum Shafiq | Mahmoud A. Zaky |
| Anwarud Din | Mahmoud Abouagwa |
| Apostolos Syropoulos | Mahmoud Higazy |
| Appanah Rao Appadu | Małgorzata Iwanek |
| Arman Shojaei | Manuel Fernández-Martínez |
| Arran Fernandez | Marcel Nicola |
| Arturo Hidalgo | Marcelo Kaminski Lenzi |
| Asifa Tassaddiq Hussain | Marcin Koniorczyk |
| Aslihan Kartci | Marek Czachor |
| Atanaska Georgieva | María Antonia Navascués |
| Audrey L. Karperien | Maria Guadalupe Morales-Macías |
| Avraam Charakopoulos | Maria Manuela Fernandes Rodrigues |
| Ayub Samadi | Maria Pop |
| Aziz Khan | Maria Rosaria Formica |
| Balaram Khatri Ghimire | Maria-Magdalena Boureanu |
| Balazs Toth | Marianthi Tsakaldimi |
| Bashir Ahmad | Mario Di Paola |
| Basit Ali | Mark Kelbert |
| Behrouz Parsa | Marta Reboiro |
| Behrouz Safarinejadian | Martin Ćalasan |
| Behzad V. Farahani | Martin Čech |
| Beny Neta | Masaaki Mori |
| Berikbol T. Torebek | Masahiro Yamamoto |
| Bharani Krishna Mynampati Arunadithya | Masao Yamagishi |
| Bodo Herzog | Massimiliano Ferrara |
| Borislav Stoyanov | Matej Babič |
| Branislav Cvetkovic | Matheus Lazo |
| Brett Altschul | Mauro Cirio |
| Bruce C. Berndt | Maxence Martin |
| Bruno Toaldo | Md. Abdul Kaium Masud |
| Byron Jacobs | Mehdi Salimi |
| Calogero Vetro | Mehmet Senol |
| Carla Pinto | Mehmet Yavuz |
| Carlo Drago | Mei Yin |
| Carlos A. Valentim | Meng Leong How |
| Carlos E. Mejía | Mengxi Shen |
| Carole Louis-Rose | Mesut Şeker |
| Chao Zhou | Michael D. Marcozzi |
| Chaudry Khalique | Michael F. Shlesinger |
| Chengming Huang | Michael (Michail) Th. Rassia |
| Chenkuan Li | Michał Niezabitowski |
| Chih-Te Yang | Mieczyslaw Cichon |
| Chih-Wen Chang | Mihaela Cristina Baleanu |
| Ching-Hsin Wang | Mihaela Neamtu |
| Chi-Shung Tang | Mihaela Simionescu |
| Cho-Hao Lee | Mikhail A. Artemov |
| Choonkil Park | Mikhail Sheremet |
| Christopher Kent | Mikk Vikerpuur |
| Chun-Yao Lee | Milena Pavlíková |
| Clara Ionescu | Ming Li |
| Claude Depollier | Mingzhe Lin |
| Claudio Arancibia-Ibarra | Mircea Ivanescu |
| Constantin Udriste | Mirjana Pantovic |
| Coronel-Escamilla Antonio | Miroslava Antić |
| Costantino Ricciuti | Mladomir Milutinović |
| Cristina Biris | Mohamad Alzayed |
| Cyril D. Enyi | Mohamed Ibrahim Abbas |
| D. G Prakasha | Mohamed M. Awad |
| Da-Chin Lour | Mohamed Rabea Eid |
| Dana-Mihaela Petroșanu | Mohammad Aslefallah |
| Daniel Bearup | Mohammad Hossein Heydari |
| Daniela Marian | Mohammad Masjed-Jamei |
| Dariusz W. Brzeziński | Mohammad Reza Mahmoudi |
| Dejian Lai | Mohammad Reza Safaei |
| Dengshan Wang | Mohammad Tamsir |
| Denis Butusov | Mohammed A. Mirzazadeh |
| Denis Nikolaevich Gerasimov | Mohammed S. Abdo |
| Devendra Kumar | Mohsen Razzaghi |
| Dimitris M. Christodoulou | Mohsen Soltanifar |
| Ding Ma | Mokhtar Abbasi |
| Dmitry Lukyanenko | Mokhtar Kirane |
| Dmitry V. Dolgy | Monika Krasowska |
| Dominic P. Clemence | Mostafa M. A. Khater |
| Dominik Kosior | Mouffak Benchohra |
| Duarte Valério | Mufutau Ajani Rufai |
| Dumitru Baleanu | Muhamamd E. Samei |
| Dumitru Vieru | Muhammad Amer Latif |
| E. Hernández-Balaguera | Muhammad Asif Zahoor Raja |
| E. L. Shishkina | Muhammad Bhatti |
| E. Providas | Muhammad Bilal Riaz |
| Ebenezer Bonyah | Muhammad I. Syam |
| Eduardo J. S. Villaseñor | Muhammad Qaiser Shahbaz |
| Elena Boguslavskaya | Murat Cancan |
| Elena Guardo | Murat Osmanovich Mamchuev |
| Elena-Corina Cipu | Mustafa Bayram |
| Eligiusz Postek | Mutaz Mohammad |
| Emanuel Guariglia | Naeem Saleem |
| Emilia Bazhlekova | Nagamani Gnaneswaran |
| Emmanuel Gonzalez | Nandalur Ameer Ahamad |
| Emmanuel Hanert | Nazar Khan |
| Erdal Karapiner | Nebojša Dedović |
| Erhan Set | Necati Ozdemir |
| Eric Florentin | Nehad Ali Shah |
| Erick Méndez | Nicolae Secelean |
| Erkinjon T. Karimov | Nicolas B. Garnier |
| Ernesto Zambrano-Serrano | Nicolás Muñoz-Galeano |
| Ervin Kaminski Lenzi | Nikolaos Koltsaklis |
| Eugene Postnikov | Nikolay A. Sidorov |
| Eulalia Nualart | Octav Olteanu |
| Eva H. Dulf | Oleg Semenovich Amosov |
| Everaldo Souto Medeiros | Olumuyiwa James Peter |
| Evgenii S. Baranovskii | Orchidea Maria Lecian |
| Evgeny V. Shchepin | Orlov Viktor Nikolaevich |
| Fabio Caldarola | Osman Tunç |
| Fahd Jarad | Ossama Kullie |
| Fairouz Tchier | Özlem Defterli |
| Fang Li | Palle Jorgensen |
| Farooq Ahmad | Panagiotis Bertsias |
| Farooq Gujar | Paolo Crippa |
| Farrukh Maksutovich Mukhamedov | Paolo Musolino |
| Farshid Mirzaee | Patrick D. Shipman |
| Fateh Mebarek Oudina | Patrick Dondl |
| Felix Sadyrbaev | Paul Lambert |
| Ferenc Izsák | Paul Popescu |
| Fernando S. Silva | Paul W Eloe |
| Foteini Kariotou | Paulo de Matos |
| Fotios Chatzitheodoridis | Paweł Drąg |
| Francesco Carrara | Paweł Zaprawa |
| Francesco Marotti De Sciarra | Pedro González-Rodelas |
| Francesco Villecco | Peng Zhao |
| Francisco Martínez González | Péter Balázs Béda |
| Frank Hansen | Peter Leach |
| Gabriela Petruta Rusu | Peter W. Egolf |
| Gabriella Vadászné Bognár | Petr Pivkin |
| Gang Li | Philippe A. Robert |
| Garik Petrosyan | Pier Nicola Sergi |
| Gaston M. N’Guerekata | Prabhakar Pradhan |
| Georgia Irina Oros | Pranay Goswami |
| Gerald L. Knapp | Pratibhamoy Das |
| Ghasem Alizadeh Afrouzi | Praveen Agarwal |
| Giacomo Ascione | Przemysław Perlikowski |
| Gilles Tissot | Pshtiwan Othman Mohammed |
| Gioacchino Alotta | Pushpendra Kumar |
| Giovanni Angiulli | Qasem M. Al-Mdallal |
| Giovanni Molica Bisci | Qiang Li |
| Giulio Cottone | Qiang Yu |
| Giuseppe Failla | Qidi Peng |
| Grigore Salagean | Qingguo Hong |
| Grzegorz Rza̧dkowski | Radu Paltanea |
| Guillermo Fernandez Anaya | Raffaela Capitanelli |
| Guillermo Huerta Cuellar | Ramin Aghababaei |
| Gülnur Yel | Rasool Shah |
| Günter Bärwolff | Ravi Agarwal |
| Gunvant A. Birajdar | Ravi Ravichandran |
| Gunvant Achutrao Birajdar | Ravshan Ashurov |
| Guofei Pang | Razvan Udroiu |
| Gustavo Adolfo Muñoz | Renat T. Sibatov |
| Gyurhan Nedzhibov | Renata Dwornicka |
| Haitao Qi | Reza Sadaati |
| Hakeem A Othman | Ricardo Díaz-Calleja |
| Hamurabi Gamboa-Rosales | Robert Vrabel |
| Hans Engler | Roberto Garrappa |
| Hassan A. Emamirad | Rodica Luca |
| Hassan Hassanabadi | Roman Ivanovich Parovik |
| Hassen Aydi | Romualdas Bausys |
| Hector Araya | Rui Xiao |
| Hengxu Song | S. M. Arifuzzaman |
| Hichem Eleuch | S. Sh. Rekhviashvili |
| Hijaz Ahmad | S.A. Edalatpanah |
| Hong Wang | S.A. Mohiuddine |
| Hongyu Liu | Sadeq D. Al-Majidi |
| Hossein Jafari | Saeed Balochian |
| Hovik Matevossian | Salih Djilali |
| Hu Chen | Salman Izadkhah |
| Humberto Rafeiro | Salvatore Sessa |
| Huseyin Budak | Samad Noeiaghdam |
| Hyunsoo Kim | Samira Hamani |
| İ. Onur Kıymaz | Sandra Klinge |
| Ibrahim Ekren | Santanu Metia |
| Ilja Kröker | Santos Bravo-Yuste |
| Ilya Boykov | Sayed Pouria Talebi |
| Ilya G. Kovalenko | Seda Araz |
| Imran Asjad | Serdar Cicek |
| Ioannis Dassios | Sergei Fedotov |
| Ioannis E. Sarris | Sergei M. Sitnik |
| Ioannis Purnaras | Sergey Grigor’evich Pyatkov |
| Irena Jadlovská | Sergey Kryzhevich |
| Ireneusz Winnicki | Sergey Pirogov |
| Isabel Sonsoles de Soto García | Sergey Pyatkov |
| Isabela Roxana Birs | Sergio Madurga |
| Ivano Colombaro | Serkan Araci |
| Jaan Janno | Seyedali Mirjalili |
| Jacek Gulgowski | Shahram Jalalzadeh |
| Jackel Vui Lung Chew | Shahram Rezapour |
| Jalil Manafianheris | Shehata E. Abdel Raheem Raheem |
| Jan Dvorak | Sheraz Aslam |
| Jan Korbel | Shin-Jye Lee |
| Ján Terpák | Shishkina Elina |
| Jan Van Casteren | Shuhua Mao |
| Janusz Brzdek | Shunsuke Hashimoto |
| Janusz Gajda | Silverio Rosa |
| Jaroslav Koton | Sinan Deniz |
| Javier E. Contreras-Reyes | S.K. Panda |
| Jay Friedenberg | Stavroula Kapoulea |
| Jaya Bishwal | Su Hu |
| Jean Pierre Boon | Sunil Kumar |
| Jen-Hsu Chang | Svetozar Margenov |
| Jeong Ryeol Choi | Teodor Atanackovic |
| Jerzy Baranowski | Thomas Michelitsch |
| Jesus Manuel Munoz-Pacheco | Tran Quyen |
| Ji Lin | Valentina Loganina |
| Jian Cao | Vasileios Fragkoulis |
| Jianfei Huang | Vladimir E. Fedorov |
| Jiangtao Du | Vladimir V. Bytev |
| Jianing Han | Vo Khoa |
| Jiaqing Wang | Woocheol Choi |
| Jiazhong Zhang | Yagub Sharifov |
| Jie Xiao | Yeou-Jiunn Chen |
| Ji-huan He | Yiheng Wei |
| Ji-hwei Horng | Yiming Chen |
| Joaquín Gayoso Cabada | Yingjie Liang |
| Jocelyn Sabatier | Yongshun Liang |
| Joel Restrepo | Yoshifumi Saijo |
| Johannes Müller | Yuliya Mishura |
| John Candelo Becerra | Yusif Gasimov |
| Jonathan Blackledge | Zakia Hammouch |
| Jorge Eduardo Macias-Diaz | Zhang Jin |
| Jorge Muñoz | Zhichao Hou |
| Jorge Sanchez-Ortiz | Ziad H. Musslimani |
| José Ángel Cid | Zuev Sergei Valentinovich |
| Jose Luis Da Silva | Zuzana Došlá |
| Jose M. Brotons |
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